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iommu/arm-smmu: Add global SMR masking property

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The current SMR masking support using a 2-cell iommu-specifier is
primarily intended to handle individual masters with large and/or
complex Stream ID assignments; it quickly gets a bit clunky in other SMR
use-cases where we just want to consistently mask out the same part of
every Stream ID (e.g. for MMU-500 configurations where the appended TBU
number gets in the way unnecessarily). Let's add a new property to allow
a single global mask value to better fit the latter situation.

Acked-by: Mark Rutland <[email protected]>
Tested-by: Nipun Gupta <[email protected]>
Signed-off-by: Robin Murphy <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
This commit is contained in:
Robin Murphy 2017-03-31 12:03:33 +01:00 • committed by Will Deacon
commit 56fbf600dd
2 changed files with 31 additions and 1 deletions
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4
drivers/iommu/arm-smmu.c
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@ -1644,13 +1644,15 @@ out_unlock:
static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
{
u32 fwid = 0;
u32 mask, fwid = 0;
if (args->args_count > 0)
fwid |= (u16)args->args[0];
if (args->args_count > 1)
fwid |= (u16)args->args[1] << SMR_MASK_SHIFT;
else if (!of_property_read_u32(args->np, "stream-match-mask", &mask))
fwid |= (u16)mask << SMR_MASK_SHIFT;
return iommu_fwspec_add_ids(dev, &fwid, 1);
}